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authorLinus Torvalds <torvalds@linux-foundation.org>2011-10-26 17:08:43 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2011-10-26 17:08:43 +0200
commit8a4a8918ed6e4a361f4df19f199bbc2d0a89a46c (patch)
treed76974986aaaa8549baf2d6a106fa6cb60d64b88 /lib
parent8686a0e200419322654a75155e2e6f80346a1297 (diff)
parent540f41edc15473ca3b2876de72646546ae101374 (diff)
downloadlinux-8a4a8918ed6e4a361f4df19f199bbc2d0a89a46c.tar.gz
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
* 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (46 commits) llist: Add back llist_add_batch() and llist_del_first() prototypes sched: Don't use tasklist_lock for debug prints sched: Warn on rt throttling sched: Unify the ->cpus_allowed mask copy sched: Wrap scheduler p->cpus_allowed access sched: Request for idle balance during nohz idle load balance sched: Use resched IPI to kick off the nohz idle balance sched: Fix idle_cpu() llist: Remove cpu_relax() usage in cmpxchg loops sched: Convert to struct llist llist: Add llist_next() irq_work: Use llist in the struct irq_work logic llist: Return whether list is empty before adding in llist_add() llist: Move cpu_relax() to after the cmpxchg() llist: Remove the platform-dependent NMI checks llist: Make some llist functions inline sched, tracing: Show PREEMPT_ACTIVE state in trace_sched_switch sched: Remove redundant test in check_preempt_tick() sched: Add documentation for bandwidth control sched: Return unused runtime on group dequeue ...
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig3
-rw-r--r--lib/Makefile4
-rw-r--r--lib/llist.c74
-rw-r--r--lib/smp_processor_id.c2
4 files changed, 19 insertions, 64 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index 6c695ff9cab..32f3e5ae2be 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -276,7 +276,4 @@ config CORDIC
so its calculations are in fixed point. Modules can select this
when they require this function. Module will be called cordic.
-config LLIST
- bool
-
endmenu
diff --git a/lib/Makefile b/lib/Makefile
index 3f5bc6d903e..a4da283f5dc 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -22,7 +22,7 @@ lib-y += kobject.o kref.o klist.o
obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
string_helpers.o gcd.o lcm.o list_sort.o uuid.o flex_array.o \
- bsearch.o find_last_bit.o find_next_bit.o
+ bsearch.o find_last_bit.o find_next_bit.o llist.o
obj-y += kstrtox.o
obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o
@@ -115,8 +115,6 @@ obj-$(CONFIG_CPU_RMAP) += cpu_rmap.o
obj-$(CONFIG_CORDIC) += cordic.o
-obj-$(CONFIG_LLIST) += llist.o
-
hostprogs-y := gen_crc32table
clean-files := crc32table.h
diff --git a/lib/llist.c b/lib/llist.c
index da445724fa1..700cff77a38 100644
--- a/lib/llist.c
+++ b/lib/llist.c
@@ -3,8 +3,8 @@
*
* The basic atomic operation of this list is cmpxchg on long. On
* architectures that don't have NMI-safe cmpxchg implementation, the
- * list can NOT be used in NMI handler. So code uses the list in NMI
- * handler should depend on CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG.
+ * list can NOT be used in NMI handlers. So code that uses the list in
+ * an NMI handler should depend on CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG.
*
* Copyright 2010,2011 Intel Corp.
* Author: Huang Ying <ying.huang@intel.com>
@@ -30,48 +30,28 @@
#include <asm/system.h>
/**
- * llist_add - add a new entry
- * @new: new entry to be added
- * @head: the head for your lock-less list
- */
-void llist_add(struct llist_node *new, struct llist_head *head)
-{
- struct llist_node *entry, *old_entry;
-
-#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
- BUG_ON(in_nmi());
-#endif
-
- entry = head->first;
- do {
- old_entry = entry;
- new->next = entry;
- cpu_relax();
- } while ((entry = cmpxchg(&head->first, old_entry, new)) != old_entry);
-}
-EXPORT_SYMBOL_GPL(llist_add);
-
-/**
* llist_add_batch - add several linked entries in batch
* @new_first: first entry in batch to be added
* @new_last: last entry in batch to be added
* @head: the head for your lock-less list
+ *
+ * Return whether list is empty before adding.
*/
-void llist_add_batch(struct llist_node *new_first, struct llist_node *new_last,
+bool llist_add_batch(struct llist_node *new_first, struct llist_node *new_last,
struct llist_head *head)
{
struct llist_node *entry, *old_entry;
-#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
- BUG_ON(in_nmi());
-#endif
-
entry = head->first;
- do {
+ for (;;) {
old_entry = entry;
new_last->next = entry;
- cpu_relax();
- } while ((entry = cmpxchg(&head->first, old_entry, new_first)) != old_entry);
+ entry = cmpxchg(&head->first, old_entry, new_first);
+ if (entry == old_entry)
+ break;
+ }
+
+ return old_entry == NULL;
}
EXPORT_SYMBOL_GPL(llist_add_batch);
@@ -93,37 +73,17 @@ struct llist_node *llist_del_first(struct llist_head *head)
{
struct llist_node *entry, *old_entry, *next;
-#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
- BUG_ON(in_nmi());
-#endif
-
entry = head->first;
- do {
+ for (;;) {
if (entry == NULL)
return NULL;
old_entry = entry;
next = entry->next;
- cpu_relax();
- } while ((entry = cmpxchg(&head->first, old_entry, next)) != old_entry);
+ entry = cmpxchg(&head->first, old_entry, next);
+ if (entry == old_entry)
+ break;
+ }
return entry;
}
EXPORT_SYMBOL_GPL(llist_del_first);
-
-/**
- * llist_del_all - delete all entries from lock-less list
- * @head: the head of lock-less list to delete all entries
- *
- * If list is empty, return NULL, otherwise, delete all entries and
- * return the pointer to the first entry. The order of entries
- * deleted is from the newest to the oldest added one.
- */
-struct llist_node *llist_del_all(struct llist_head *head)
-{
-#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
- BUG_ON(in_nmi());
-#endif
-
- return xchg(&head->first, NULL);
-}
-EXPORT_SYMBOL_GPL(llist_del_all);
diff --git a/lib/smp_processor_id.c b/lib/smp_processor_id.c
index 4689cb073da..503f087382a 100644
--- a/lib/smp_processor_id.c
+++ b/lib/smp_processor_id.c
@@ -22,7 +22,7 @@ notrace unsigned int debug_smp_processor_id(void)
* Kernel threads bound to a single CPU can safely use
* smp_processor_id():
*/
- if (cpumask_equal(&current->cpus_allowed, cpumask_of(this_cpu)))
+ if (cpumask_equal(tsk_cpus_allowed(current), cpumask_of(this_cpu)))
goto out;
/*